Iran's Revolutionary Guards fired at least two missiles at commercial ships transiting through the Strait of Hormuz on Monday night, Axios reported, citing two US officials.
Two commercial ships suffered significant damage but had no casualties, the report said, citing a US official.
Separately, Britain's maritime security agency said a tanker caught fire after being hit by an unknown projectile early on Tuesday.
The United Kingdom Maritime Trade Operations (UKMTO) said the incident took place eight nautical miles east of Limah, Oman, according to AFP.
“A tanker has reported being hit by an unknown projectile on the port side causing a fire, whilst travelling southbound,” UKMTO said in a post on X.
The agency said there were no reports of casualties or environmental damage.
“Vessels are advised to transit with caution and report any suspicious activity to UKMTO,” the agency added, saying authorities were investigating.
Since March, a number of commercial vessels came under attack in the Strait of Hormuz when Iran blockaded the waterway in response to US-Israeli attacks.
In return, the United States imposed its own naval blockade and later launched retaliatory strikes against Iran after accusing Tehran of targeting commercial shipping.
Maritime traffic resumed after Washington and Tehran signed a memorandum of understanding on June 17 aimed at ending the conflict and reopening the strategic route.
However, Iran has insisted there will be no return to pre-war arrangements, under which vessels could pass freely through the strait.
Tehran has warned ships against using routes outside a corridor it has authorized along its coastline.
